Tripping Out: Breaking Out and Setting Back the Kelly
During tripping-out operations, the kelly is broken out from the drill string and set back into the rathole. This task involves stopping circulation, disconnecting the kelly, and pulling it clear of the rotary table before guiding it into position. Because the kelly is heavy, elevated, and often coated with drilling fluid, this operation presents several struck-by, slip, and pinch hazards.
Potential Hazards
- Release of excess drilling mud during breakout, resulting in skin contact, slippery surfaces, and loss of footing.
- Being struck by slip handles if the rotary table is used to spin the drill string during breakout.
- Being struck by the kelly if the pullback line unhooks, breaks, or is improperly attached while the kelly is being pulled toward the rathole.
- Pinch-point hazards when handling the kelly, slips, or pullback equipment.
The kelly is pulled clear of the rotary table and set back into the rathole.
Possible Solutions
- Shut down the mud pumps before breaking out the kelly to prevent uncontrolled mud flow.
- Close the mud saver valve on the kelly (if installed) to minimize fluid release.
- Use a mud bucket or diverter to control and redirect excess mud away from workers and walking surfaces.
- Stand clear of the rotary table whenever it is rotating, and keep hands and body parts away from moving components.
- Consider alternative technologies—such as pipe spinners, kelly spinners, or top drive systems—to reduce or eliminate hazards associated with rotary table spin-up.
- Implement and follow an effective pullback line attachment and inspection procedure before moving the kelly.
- Ensure workers position themselves in a safe location away from the pullback line, swing path, and rathole during the pullback operation.
- Maintain good housekeeping by cleaning up spilled mud promptly to prevent slips and falls.
Knowledge Check Choose the best answer for the question.
6-3. Why is it dangerous to stand near the rotary table while it is rotating?
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